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Biology 1114 > History of Life > Flashcards

History of Life Flashcards

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1
Q

Earth Formation

A

We are made of stars

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2
Q

Hadean

A

(ca 4600-3850 Ma) Differentiation of earth into crust, mantle, and core. Origin of atmosphere. formation of freshwater

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3
Q

What is life

A

autonomous replication (mitosis/meiosis), complexity, ability to evolve

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4
Q

Requirements of life

A

energy source, basic chemicals, fitting external environment

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5
Q

Archean

A

(3850-2500 Ma) Origin of life at 3800 Ma. Photosynthetic organisms 3500 Ma. Oxygen environment 3500-2800 Ma

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6
Q

Continents Form

A

3400, collisions of smaller land masses

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7
Q

Archaean life

A

Various Bacteria, Archaea

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8
Q

Proterozoic

A

(2500-542 Ma) origin of Eukaryotes, multicellular soft bodied animals

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9
Q

Eukaryotic Cell

A

DNA storage, RNA transcription, Membrane bound organelles

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10
Q

Serial Endosymbiosis Theory

A

Eukaryotic cells evolved when aerobic bacteria affected larger host cell. Ex Chloroplast/mitochondria

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11
Q

Challenges of Multicellularity

A

Need for support, difficult reproduction, surface to volume ration goes down as size increases, metabolic demands.

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12
Q

Cambrian Explosion

A

sudden appearance of diverse animal forms 450 mya

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13
Q

Intrinsic explanations (Cambrian explosion)

A

genes duplicated in bilaterians

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14
Q

Extrinsic Explanations (Cambrian explosion)

A

sufficient O2 became available for larger animals, or arms race with evolution

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15
Q

Abiogenesis

A

Life originated from abiotic precursors that existed here on earth - T. H. Huxley

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16
Q

Panspermia

A

Life on earth originated from biotic or abiotic precursors that arrived from extraterrestrial sources. Murchison meteorite carried amino acids

17
Q

Miller Urey experiment

A

synthesized organic compounds from inorganic precursors, experiment created 20+ different amino acids

18
Q

RNA world Hypothesis

A

early life based on RNA, Short lived once oxygen became abundant, DNA is more stable

Biology 1114 (18 decks)

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